A flexible hybrid strain energy harvester using piezoelectric and electrostatic conversion

Youngkee Eun, Dae Sung Kwon, Min Ook Kim, Ilseon Yoo, Jaesam Sim, Hee Jin Ko, Kyung Ho Cho, Jongbaeg Kim

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


A new design of flexible energy harvester to utilize piezoelectric and electrostatic energy conversion mechanisms simultaneously from a single mechanical energy source is proposed. This non-resonant type harvester enables low-frequency mechanical inputs to be converted to electricity, and the polymeric structures make the harvester mechanically flexible, allowing it to be applied to non-planar surfaces. The fabricated harvester generated peak- and average power densities of 159 and 1.79 μW cm-2 respectively by piezoelectric conversion, and 52.9 μW cm-2 and 1.59 nW cm -2 respectively by electrostatic conversion from an input force of 1.2 N at 3 Hz. Considering its flexibility and ability to harvest mechanical inputs at frequencies below 3 Hz, low-frequency human movements could be a potential energy source for the proposed hybrid harvester to exploit.

Original languageEnglish
Article number045040
JournalSmart Materials and Structures
Issue number4
Publication statusPublished - 2014 Apr

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Civil and Structural Engineering
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering


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